207Pb/206Pb ages and Hf isotope composition of zircons from sedimentary rocks of the Ukrainian shield: Crustal growth of the south-western part of East European craton from Archaean to Neoproterozoic

• Published in: Precambrian research 2015-05, Vol.260, p.39-54
• Main Authors: Shumlyanskyy, Leonid, Hawkesworth, Chris, Dhuime, Bruno, Billström, Kjell, Claesson, Stefan, Storey, Craig
• Format: Article
• Language: English
• Subjects: Archaean; Crustal growth; East European craton; Hf isotopes; Proterozoic; Zircon
• ISSN: 0301-9268; 1872-7433
• DOI: 10.1016/j.precamres.2015.01.007

•Ages and Hf isotopes in detrital zircons from the Ukrainian shield were analysed.•Ages of deposition and probable sources of detrital material have been assumed.•Crustal growth events at 3.75, 3.15–3.20, 2.2–2.0, and 1.5Ga were identified. The results of simultaneous LA-ICP-MS measurements of 207Pb/206Pb and Hf isotope ratios are reported for zircons separated from five Ukrainian shield sedimentary rocks: (1) c. 3.0Ga quartzite of the Bug Series; (2) c. 2.0Ga quartzite of the Topilnya Series; (3) c. 1.75Ga quartzite of the Ovruch Series; (4) c. 1.2–1.0Ga sandstone of the Polissya Series; and (5) c. 0.6Ga conglomerate of the Volyn Series. The age–Hf isotope (ɛHfT) data indicate four main crustal growth events at 3.75, 3.20–3.15, 2.2–2.0, and 1.5Ga in the south-western part of the East European craton (EEC). An additional rather minor event could have place at 2.5–2.4Ga. The oldest event is represented by enderbites of the Bug domain in the south-western part of the Ukrainian shield. The second crust-forming event occurred at c. 3.20–3.15Ga and it is documented by detrital zircons separated from the Bug Series quartzite and metasediments of the Soroki greenstone belt, Azov domain. A small number of zircons with positive ɛHfT values reveal some input of the juvenile material into the crust at 2.5–2.4Ga, whereas the 2.2–2.0Ga event is dominated by zircons with positive ɛHfT values. The youngest event is represented by numerous zircons that crystallized at c. 1.5Ga. The possible sources of these zircons are the rock complexes of the south-western part of the Fennoscandian shield.